Screw driver



Jan. 5, 1932. H, J, @00K 7935 SCREW DRIVER Filed April 7, 1.951

mwntoz mz/wf SCISJL W DEVEE?,

Application lefi April 7,

Y per huniie eelried by the bois'eex. i iiiustiative diseiosue, the imihe present invent-ion are hy of exempliioaiion only es bencorpoi'etefi in e, screw (irive.

ein@ of the present invention is 'to ie on iiovefi tool of @his seri; having sus eoiues o novelty emi aiventsge, d vhieh i nsrgicuiarly ohareeeiized by ,"z'engh idurability smi the secui'iy i which the shenk and bolster are fined against tunning and iongitudinai `feinens.

i" if of the invention is flo proii-miie sind servieeahie scew eonsviietion sind miopteei to i manufactured. Y iii ei* aim of the invention is to pioviiie en inipioved method of making s, "crew driven eonstrueied in accordance Wih presen@ invenion. @ther ohjieos virili he in part obvious ond e invenion aeeordingiy Consists in the .tires oi' consuuction, combination of eiezvens iiangeinent of parte which Wiil l ined in he construction hereinoi-'h and the scope of the e piieeiich xviii be indieaied in i: e ep- .ienie cisiins.,

C fr we" port poinieo out more in detail herein-V iihe accompanying drawings, wherein:

JS. Sealshowing the ooistei es having been ioeied on the shank; anci Fig. 6 is an elevzionsiV view o' the iinishe. holster.

Referring to i'he drawings een notes the shank oi the tooi having; end an operating portion b which ney ne o suitable form, such as a. screw iiiivei hieiie. e designates generally e boistei see red to he othei` end of the shank; o?, a hoodie oi 'vvoo er the like, emi e, a ernie ehoni: the 'forward eno. of the Wooifien hriniie.

n accordance Wii'h he present inveni'ion, i'he shank a is preiembiy foinie fiom e round piece of stock cui; to prone? eng-h 'hen deformed at one end te provide hiesie The shrink, si; iis ohev: end, is piovicie i iviih suiiinhie number oi' cv'iveumfei'entioi gooves i() inierrupteei by paiiitions or lugs il. in ehe piesent instance, tivo smh gioeves are iiiusiated, and each groove hes iiour spaced apart partitions or ribs. The giooves9 bvpreieenceare rounded or curved in eioss secion, and he ings of partiiions il have their outer edges insh with he perimeter of the shank. it is understooi ihet this portie im' errangemene is shown by wey of iiius eration only, and the emot number of grooves and the ribs therein muy he voriei. The grooves and the ribs therein may he economiealiy and easily formed, hv suiehie pee/seing dies.

The boisier e has s whe-like portion or sleeve 12 provided ai: one end `with a. heei i3 which forms e rofiieiiy exzening shoniciei 1li against whieh the iorfferd end of the hen die is adapted 'to engage. The heeci i3, which may be of any suitable configuration, is preferabiy tapered down so es to menge into the shank. The boister has e hose 12a open at the headed or forweid end of the hoistei'. This bore is substantieiiy of the same diameter as that of the shank so that Jehe latter: Wiii have a close fit therein. The holster is provided with external eircumferenin rings or beads 15 preferably curved in cross section and each of a mass substantially equai to the volume of a respective groove if?) in the shank. These rings 15 are so positioned their, `when the shank has been inserted and botaoified and are interrupted by the inthe bore of the bolster, they register with the grooves l0 of the shank, as shown most clearly in Fig. 4;. After the parts have been assembled, as shown in Fig. 4, the sleeve of the bolster is positioned between suitable dies, and these dies move towards each other so as to cause the metal about the grooves to flow into those grooves, thus bringing the bolster to the shape shown in Fig. 5. ln this operation, the metal of the bolster is forced into the grooves so as to completely fill the same, and the external periphery of the sleeve of the bolster is brought to cylindrical form throughout its length. In eect, internal rings or beads 15a are formed on the sleeve, and these rings engage in the grooves partitions ll. Thus, there is formed, between the bolster and the shank, interlocks which hold the bolster on the shank against turning or axial movement.

By preference, lon itudinally extending ribs 16 are then forme on the exterior of the sleeve 12, four of such ribs bein shown in the present illustration. These ribs may be formed by placing the sleeve of the bolster loctween suitable dies and squeezing the ribs up from the circumferential surface ot' the sleeve.

The handle d has, at its forward end, a bore 20 of substantially the same diameter as that of the sleeve 12 of the bolster so that the sleeve will closely lit therein. After the bolster has been secured tothe shank, and the ribs 16 have been formed on the bolster, the handle, with the ferrule e, thereon is brought into position with respect to the bolster, and then the handlevis driven onto the bolster. When the handle is driven or forced onto the bolster, the ribs 16 cut grooves in the wall of the bore of the handle so that the bolster and handle are secu rely held together against turning movement.

From the foregoing description, taken in bol connection with the accompanying drawings, it will be seen that my improved screw dr1ver, while of sini le nature and capable of being economica ly manufactured, is very strong and durable, and the bolster is so' l securely and rigidly anchored to the shanlr that there is no danger of these elements pulling a art or turning one relative to the other. he engagement of the internal rings or swells 15a of the bolster in the grooves of the shank prevent axial movement between the bolster and the shank. These rings are in the form of a series of lugs between'which lt the partitions or lugs ll so that turning movement between the bolster and the shank is guarded against. The handie is securely fastened to the bolster.

As many changes could be ,made in the above construction, and many apparently widely different embodiments of this invena tion could be made without departing from :lessees the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying' drawings shall be interpreted as illustrative and not in a limiting sense. y

lt is also to be understood that the lan guage used in the following claims is intend ed to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

I claim as my invention:

1. In a screw driver, a shank having a blade at one end and a circumferential groove adjacent its other end, said groove having parti tions, a bolster having a sleeve closely tting about the grooved end of the shank, said bolster having an internal ring or bead tting in said groove and interloclred with said partitions, and a handle having a bore close ly receiving said sleeve.

2. ln a screw driver, a shank having' a blade at one end and a circumferential groove adjacent its other end, said groove having a plurality of partitions extending generally lengthwise ot the shank with the outer edges of said artitions substantially ilush with the circumfrence of the shank, a bolster having a bore closely receiving the grooved end of said shank and having an internal ring intermediate its ends and contracted into and engaging in said grove and interloclred with said ertitions, and a handle having a bore closell; receiving said bolster.v

3. In a screw driver, a shank having a blade at one end and a circumferential groove adjacent its other end, partitions in and estending across said groove, a bolster having a sleeve with a head at one end and a bore open at the headed end of the end of said shank being closely fitted in and being bottomed in said bore, the sleeve of said ster having an internal circumferential ring or bead contracted into said groove and interloclred with the partitions thereof, longitudinally extending ribs on the exterior ci@ said sleeve, and a handle having a bore closen y receiving said sleeve with the ribs extending into the wall of the bore of the handle.

. d. In a screw driver, a shank having an operating portion at one end and a plurality of circumferential grooves adjacent its other end, each of said grooves having partitions extending thereacross, a bolster having sleeve closely fitting about the grooved end of the shank, said bolster having internal rings or beads fitting in said grooves and intenA locked with said partitions, and a handle havingr a bore closely receiving said sleeve.

5. ln a scieiv driver, a shanlr having a blade at one end and a pair of circumferential grooves adjacent its other end, `goari'r-itions in said grooves, a

and extending across each bolster having a sleeve with a head at one i' bolster, the grooved end and a bore open at the headed end of the bolster, the grooved end of said shank being closely fitted in and being bottomed in said bore, the sleeve of said bolster having 5 internal circumferential rings or beads contracted into said grooves and interlocked with the partitions thereof, lon 'tudinally extending ribs on the exterior o said sleeve, and a handle having a bore closely receiving said lo sleeve with the ribs extending into the wall of the bore of the handle.

6. The method of constructing the herein described tool, which consists in forming on a round'shank a circumferential groove with partitions extending across the groove, forming a bolster having a sleeve portion and an external integral bead on the sleeve portion,

slipping the bolster over the grooved end of said shank and to a position where said bead is in registry with said groove, then contacting the beaded portion of said sleeve, there by forming an internal bead on the bolster contracted into said groove, and slipping a handle; over said bolster.

7. The method of constructing the herein described tool, which consists in forming on and adjacent one end of a shank a circum- K ferential groove provided with transverse I partitions, forming a bolster with a sleeve,

a bore open at'one end of the sleeve and an external circumferential bead on the sleeve, slipping the bolster onto the grooved end of the shank to a position Where the bead substantially registers with the groove, then ap- $5 plying pressure radially and inwardly against the bead to cause the metal of the bolster to flow into said groove and bring the external circumference of the bolster into cylindrical form, forming on the external circumference of said sleeve longitudinally extending ribs, providing) a handle having "a bore at one end of su stantially the same diameter as the external diameter of the sleeve, and forcing said sleeve into said bore.

,5 HARRIS J. oooK. 

